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Sagot :
Answer:
[tex]x = - 4[/tex]
[tex]y = - 4[/tex]
Step-by-step explanation:
Looking at these equations, we can see neither x or y have the same coefficient. Therefore, we need to multiply or divide, to make either the x or the y the same. It's less of a hassle to make the Xs the same, so let's do that. Taking the top equation and multiplying it by 4, we get:
[tex]4x - 20y = 64[/tex]
Now let's subtract the top equation from the bottom equation, leaving us with a third equation:
[tex] - 18y = 72[/tex]
Divide 72 by -18 to get
[tex]y = - 4[/tex]
Now let's substitute into our first equation to find X:
[tex]x + 20 = 16[/tex]
Leaving us with:
[tex]x = - 4[/tex]
Now let's substitute into the second equation to check our solution is correct:
[tex] - 16 + 8 = - 8[/tex]
This is correct, so the answer is X and Y are both equal to -4
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